:root {
  --bg: #f4f3ef; --card: #ffffff; --ink: #1d1d1b; --muted: #6b6a64; --line: #e3e1da;
  --accent: #2d5b8a; --accent-ink: #fff; --ok: #2f7d4f; --warn: #a86b12; --bad: #b3362d; --bar: #e9e7e0;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #161615; --card: #22221f; --ink: #ecebe6; --muted: #a09f97; --line: #34332f;
    --accent: #6fa1d6; --accent-ink: #0d1b2a; --ok: #6cc08b; --warn: #e0a84a; --bad: #ef7a6f; --bar: #2f2e2a;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 16px/1.45 -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  padding-bottom: env(safe-area-inset-bottom);
}
header {
  position: sticky; top: 0; z-index: 5; background: var(--bg);
  padding: calc(env(safe-area-inset-top) + 8px) 16px 0; border-bottom: 1px solid var(--line);
}
.top { display: flex; align-items: center; gap: 10px; }
.top h1 { font-size: 18px; margin: 0; flex: 1; letter-spacing: .2px; }
.top .pill { font-size: 12px; }
nav { display: flex; gap: 4px; overflow-x: auto; scrollbar-width: none; margin: 8px -16px 0; padding: 0 16px 8px; }
nav::-webkit-scrollbar { display: none; }
nav a {
  flex: none; padding: 7px 12px; border-radius: 999px; color: var(--ink); text-decoration: none; font-size: 15px;
}
nav a.on { background: var(--ink); color: var(--bg); }
main { max-width: 860px; margin: 0 auto; padding: 14px 16px 40px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 14px; margin-bottom: 12px; overflow-wrap: anywhere; min-width: 0; }
.card h2 { font-size: 16px; margin: 0 0 8px; }
.card h3 { font-size: 15px; margin: 12px 0 6px; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 250px), 1fr)); gap: 12px; }
.grid .card { margin: 0; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.big { font-size: 26px; font-weight: 650; line-height: 1.1; }
.row { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.row.between { justify-content: space-between; }
.stack > * + * { margin-top: 8px; }
.list { list-style: none; margin: 0; padding: 0; }
.list li { padding: 9px 0; border-top: 1px solid var(--line); display: flex; gap: 8px; align-items: center; }
.list li:first-child { border-top: 0; }
.list .grow { flex: 1; min-width: 0; overflow-wrap: anywhere; }
button, .btn {
  font: inherit; font-size: 15px; border: 1px solid var(--line); background: var(--card); color: var(--ink);
  padding: 9px 14px; border-radius: 10px; cursor: pointer; text-decoration: none; display: inline-block;
  -webkit-tap-highlight-color: transparent; min-height: 40px; max-width: 100%; overflow-wrap: anywhere;
}
button.primary, .btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
button.danger { color: var(--bad); }
button.sm, .btn.sm { padding: 5px 10px; font-size: 14px; min-height: 32px; }
button:disabled { opacity: .5; }
input[type=text], input[type=password], input[type=number], input[type=url], select, textarea {
  font: inherit; font-size: 16px; width: 100%; padding: 9px 11px; border-radius: 10px; border: 1px solid var(--line);
  background: var(--bg); color: var(--ink);
}
label { display: block; font-size: 14px; color: var(--muted); margin: 8px 0 4px; }
label.check { display: flex; gap: 8px; align-items: center; color: var(--ink); font-size: 15px; margin: 6px 0; }
input[type=checkbox] { width: 20px; height: 20px; accent-color: var(--accent); }
.pill { display: inline-block; padding: 2px 9px; border-radius: 999px; background: var(--bar); font-size: 13px; }
.pill.ok { color: var(--ok); } .pill.warn { color: var(--warn); } .pill.bad { color: var(--bad); }
.bar { height: 6px; background: var(--bar); border-radius: 3px; overflow: hidden; margin-top: 6px; }
.bar > i { display: block; height: 100%; background: var(--accent); width: 0; transition: width .3s; }
pre, code { font: 13px/1.4 ui-monospace, SFMono-Regular, Consolas, monospace; }
pre { background: var(--bg); border: 1px solid var(--line); border-radius: 8px; padding: 8px; overflow-x: auto;
  white-space: pre-wrap; overflow-wrap: anywhere; margin: 6px 0 0; max-height: 260px; }
code { background: var(--bar); padding: 1px 5px; border-radius: 5px; overflow-wrap: anywhere; }
.toast {
  position: fixed; left: 50%; bottom: calc(env(safe-area-inset-bottom) + 18px); transform: translateX(-50%);
  background: var(--ink); color: var(--bg); padding: 10px 16px; border-radius: 12px; font-size: 15px; z-index: 20;
  max-width: calc(100% - 32px); box-shadow: 0 4px 16px rgba(0,0,0,.2);
}
.err { color: var(--bad); }
ol.steps { padding-left: 20px; margin: 6px 0; } ol.steps li { margin: 6px 0; }
.deck { display: flex; gap: 8px; align-items: center; padding: 6px 0; border-top: 1px solid var(--line); }
.deck .n { min-width: 34px; text-align: right; font-variant-numeric: tabular-nums; font-size: 14px; }
.n.new { color: var(--accent); } .n.learn { color: var(--bad); } .n.due { color: var(--ok); }
.shelf { border: 1px solid var(--line); border-radius: 12px; padding: 10px; margin: 8px 0; }
.picker { max-height: 320px; overflow-y: auto; border: 1px solid var(--line); border-radius: 10px; padding: 0 10px; margin-top: 6px; }
.hide { display: none !important; }
.login { max-width: 360px; margin: 12vh auto 0; padding: 0 16px; }
.drop { border: 2px dashed var(--line); border-radius: 12px; padding: 14px; text-align: center; }